• Webster's Revised Unabridged Dictionary
    • n pyrrole (Chem) A nitrogenous heterocyclic base found in coal tar, bone oil, and other distillates of organic substances, and also produced synthetically as a colorless liquid, C4H5N, having on odor like that of chloroform. It is the nucleus and origin of a large number of derivatives. So called because it colors a splinter of wood moistened with hydrochloric acid a deep red.
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Webster's Revised Unabridged Dictionary
Gr. flame-colored (from fire) + L. ol,eum oil


In literature:

The compound, or compounds, known as "caffetannic acid" are probably the source of catechol, as the proteins are of ammonia, amins, and pyrrols.
"All About Coffee" by William H. Ukers
It gives the pine-shaving reaction, in this respect resembling pyrrol (q.v.).
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3" by Various